Saw O (Burmese: စောအို, pronounced [sɔ́ ʔò]; also known as Saw Aw (စောအော, [sɔ́ ʔɔ́]); 1284–1323) was king of Martaban from 1311 to 1323. He transformed Martaban into a truly independent kingdom by successfully breaking with its hitherto nominal overlord Sukhothai. He was put on the throne by his parents Gov. Min Bala of Myaungmya and Princess Hnin U Yaing, who had staged a coup against King Hkun Law. O emerged only after his father's death in the mid-to-late 1310s. He successfully broke with Sukhothai in 1317/18, and went on to capture Lamphun and the Tenasserim coast by 1321.